17491949 has 2 divisors, whose sum is σ = 17491950. Its totient is φ = 17491948.

The previous prime is 17491931. The next prime is 17491973. The reversal of 17491949 is 94919471.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12460900 + 5031049 = 3530^2 + 2243^2 .

It is an emirp because it is prime and its reverse (94919471) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-17491949 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17491909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8745974 + 8745975.

It is an arithmetic number, because the mean of its divisors is an integer number (8745975).

Almost surely, 2^17491949 is an apocalyptic number.

It is an amenable number.

17491949 is a deficient number, since it is larger than the sum of its proper divisors (1).

17491949 is an equidigital number, since it uses as much as digits as its factorization.

17491949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 44.

The square root of 17491949 is about 4182.3377434158. The cubic root of 17491949 is about 259.5848849187.

The spelling of 17491949 in words is "seventeen million, four hundred ninety-one thousand, nine hundred forty-nine".